section 1.2 notes
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Section 1.2 NOTES. Studying Populations. II A. DETERMINING POPULATION SIZE : How do you determine the population size of a species? 1. Direct Observation 2. Indirect Observation 3. Sampling 4. Mark and Recapture. II A. Match The Methods. - PowerPoint PPT PresentationTRANSCRIPT
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Section 1.2 NOTES
Studying Populations
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II A. DETERMINING POPULATION SIZE:
How do you determine the population size of a species?1. Direct Observation2. Indirect Observation3. Sampling4. Mark and Recapture
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II A. Match The MethodsCounting Individual organisms Indirect Observation
Counting organisms in a small sample then projectting to a larger, similar area Mark and Recapture
Locating nests and estimating organismsper nest Sampling
Capturing, Marking, then recapturingAnd using the frequency of recapturing Direct ObservationTo determine Population Size
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II B. Changes in Population Sizes
• When New Members Join or Leave a Population1. Birth and Death Rates 2. The Population Statement3. Immigration and Emigration4. Graphing Changes in Population5. Population Density
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1.Births and Deathsa.Births = additions, Deaths = subtractions
2.The Population Statementa.Birth Rate > Death Rate = Population increasesb.Birth Rate < Death Rate = Population decreases
3.Immigration and Emigrationa.Individuals moving INTO a populationb.Individuals moving OUT of a population
4.Graphing Changes in Population5.Population Density
a.Number of individuals / Unit area
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4. Graphing Changes in a Population
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Thomas Austin of England introduced introduced 24 breeding rabbits in October 1859 as game for shooting parties… BIG
MISTAKE!
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Population Density
• The number of individuals in an area of a specific size• Population growth and resulting higher population
density is often argued to lead to increased stress on water and natural resources, decreased food security.
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II C. Limiting Factors (abiotic resources)1. Environmental factor that causes a population to
decreasea. Food and Waterb. Space
i. Carrying Capacity1. The largest population that an area can
support.c. Weather
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Carrying Capacity is the largest population an area can support.
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Section 1.3 NOTES
Interactions Among Living Things